Codes, Ciphers and Spies: Tales of Military Intelligence in World War I by John F. Dooley

Author:John F. Dooley [Dooley, John F.]
Language: eng
Format: epub
Tags: science, history, computers, Information Theory, General, Programming, Algorithms
ISBN: 9783319294155
Google: lc3tCwAAQBAJ
Publisher: Springer
Published: 2016-03-31T23:16:44.981952+00:00

The prisoner has to depend upon the keenness of the person who receives his letter to find out that he has written a message by using the first and last words and middle words of alternating lines to express what he has to say. Undoubtedly the attention of any intelligent person would have been arrested by the odd and almost silly character of the first half of the letter. The writer expected this, and the occurrence of such words as “treat,” “ink,” “writing,” and “finish” to induce his correspondent to study out the system. It will be seen that the middle, first, and end words taken in proper order read:Treat this letter with solution

half ink with half water in a

dish. Just dip the sheet till

immersed then remove and writing

should appear. Finish.

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